li {
    list-style: none;
}

#mydiv1 {
    width: 600px;
    height: 500px;
    background-color: chocolate;
}

#mydiv2 {
    width: 200px;
    height: 200px;
    background: url('../images/card.jpg');
    background-size: cover;
}

#mydiv3 {
    width: 200px;
    height: 200px;
    background: url('../images2/card.jpg');
    background-size: contain;
}